Please don't use your personal observations to discount the growing collection of evidence that this sort of thing is happening at tech companies around the world, and not just in the bay area.
If you're going to use personal experience as evidence for some phenomenon, you need to accept personal experience from every angle, not just the angle that agrees with your perception of the phenomenon.
These are just a short list of samples of articles that are based on surveys, studies, and legal opinions (and that's all I could find in literally the time it took me to pour my espresso this morning).
http://www.jstor.org/stable/1229336?seq=1#page_scan_tab_cont...
http://fortune.com/2014/08/26/performance-review-gender-bias...
http://www.iflscience.com/editors-blog/men-and-women-biased-...
https://www.wired.com/2014/07/gender-gap/
https://theestablishment.co/new-study-finds-60-of-women-in-t...
https://mic.com/articles/132285/most-women-in-tech-say-they-...